Actually surprisingly moddable, was first able to make the Yak a rocket with 128 guns, then managed to add my own model to the game, 10/10
Well, the game doesn't model supersonic effects (mainly drastically increased drag). About the 3d models, I don't exactly remember. They are the .obj files in the meshes directory; the .mtl files are probably the colours. I made them in wing3d and exported them as obj; I have a feeling the game uses the names of the meshes in each file to know what is the main fuselage, what is an aileron, etc.
I see. So as long as the wing positions are valid to the mesh used there shouldn't be any problems with modifying it, and as long as i export it as an .obj file the game will be able to use it.
When i tried importing a custom model the wing positions were off so it would just crash, that must've been it.
I also wanted to try making a VTOL style aircraft and maybe make the wheels pivot (using the rudder controls) to make planes more maneuverable on the "ground" but I don't think that's possible without digging into the code.
Thanks